netdev - Re: Multicast socket behaviour?

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Message-ID:  <loom.20080814T000653-690@post.gmane.org>
Date:	Thu, 14 Aug 2008 00:08:58 +0000 (UTC)
From:	Daniel Ng <daniel_ng11@...os.com>
To:	netdev@...r.kernel.org
Subject:  Re: Multicast socket behaviour?

David Stevens <dlstevens <at> us.ibm.com> writes:
> it usually doesn't make sense for an app in a single multicast
> routing domain to want to join on multiple interfaces

Now, what if I have a linear network of say 3 Linux boxes, connected together 
simply:

A----PPP0-------B-----PPP1------C

All machines are DVMRP multicast routers.

In order for B to hear the multicast packets originated from both A and C, 
wouldn't B need to join the DVMRP multicast group on *both* its PPP interfaces?

If so, then can this be done with a single socket? How?

Daniel

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